Update the Introduction of Tutorials section of the Maps guides for 2.4

[jyaistMap]

Update the Maps -> Tutorials -> Introduction guide to reflect 2.4

• added a section to display Map Service Layers
• updated introductory paragraph to reflect 2.4 modules and names:
  • @jtroe @nanaeaubry @achapkowski Can you please read through that paragraph and let me know if it should be rewritten?
• updated the Object Model Diagram to replace MapView Class Diagram with what I could find:
  • @jtroe @nanaeaubry @achapkowski - Please look at this - is this worth adding? Is there a better way to create an Object Model Diagram for Python classes? I don't know what software was used to create the current ones.